A database document is just a collection of information stored in computerized form. The simplest way to understand a database is to think of it like a set of 3 x 5 cards. Since the information is on your computer, though, a dick of the mouse or the stroke of a key can alphabetize those "cards," or find just the names of the people on the cards who live in a certain town, or tell you who owes how much money, and so on.

Data recovery is the art of restoring lost or damaged files. This damage can occur when your computer crashes, a virus infects, you accidentally reformat a disk that contains precious data, or you experience some other catastrophe of considerable dimension. And, at some point in your life, you're going to delete a file you really didn't mean to (believe me). The next time tragedy strikes, try running one of the many data recovery applications (powerful software written specifically for data recovery purposes) to see if it can correct the situation. Often these little jewels work magic and save your day-and your files.

dBase is a specific software product used for creating and manipulating relational databases. The term can also refer to the dBase database programming language that first appeared in the dBase product, but which is now available in many other database forms.

In a computerdatabase, the database engine is the software that does the real work of sorting the information, finding specific data that you request, and so on. The term used to refer to a separate piece of software that ran on a central computer (in this case, it is more or less synonymous with the term "back-end"). Widely used database engines include Oracle, DB2, and Sybase. Separate front-end software running on your own computer lets you tell the database engine what to do (how to sort the data, what data to find), and displays the results of your commands.

The database is the location to store the data. Firstly we used excel sheet to store the data. However, it has some problem with data integrity and redundancy problem. This problem solved by E.F. Codd proposed a model in 1970. This model was straightforward. It used the concept of mathematical relation which looks like a table.

Relation Algebra is a procedural query language for RDBMS (Relational Database Management System). An Algebra based on the set of operators (like Arithmetic operator, union, intersection relational operator, etc.) and operand. Edgar F. Codd created it for a relational database. Relational Algebra provides a fundamental query for retrieving data from databases. The retrieved result from algebra expression is a relation which formed from one or more relations. Relational Algebra specifies many operations to manipulate relations.

The database is a repository of all types of data. After storing it, there should be a mechanism to access, manipulate and update it. For this, we have a tool in the form of a query to perform all these operations. There are many query language like SQL, Search Engine Query Language (Google, Bing), DMX (Data Mining Language), etc. All these languages have different function and their function structure used for the different data model.

The database schema is a structure or architecture to store data in the database. It creates abstraction(hide the lowest level the detail from the user) between application and physical database. A user creates a relationship with the help of Database Management System.But a user can’t see which type of data structure is used by the system to store the data in it.This data structure may be linear and may be non-linear, we don’t know. This is known as Abstraction. The database divided into three-level architecture is also known as three; schema architecture.

Data base management system (DBMS) represent the management of data which includes various processes like collection of related data , storing and retrieving them, using set of programs for easy and effective manner. While it may sound quit simple and easy but in reality it is not. As the bulk of data increases with the complexity of systems and multiple process running head to head it leads to most feared complication called Deadlock. It is nightmare for the developers and programmers. We will be discussing in detail everything about this evil Deadlock in our following article below. Starting with the definition first.